AFVI Teach - green (no-install) build.

Unpack this folder anywhere writable and run teach-imgui.exe. Nothing is registered, no shortcut
is created and nothing is written outside this folder: the configuration (afvi.toml), the camera
output (captures) and downloaded updates (updates) all live next to the program.

This file is also the marker that tells the program it is the portable build: an update downloads
the new zip, waits for the program to close, replaces the files in this folder and starts the new
version - the installer is never involved. Delete this file and the program will treat itself as
an installed copy again.
